Four-year aerosol observations with a Raman lidar at Thessaloniki, Greece, in the framework of European Aerosol Research Lidar Network (EARLINET)

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Four-year aerosol observations with a Raman lidar at Thessaloniki, Greece, in the framework of European Aerosol Research Lidar Network (EARLINET) (EN)

Giannakaki, E (EN)
Papayannis, A (EN)
Amiridis, V (EN)
Balis, DS (EN)
Bais, A (EN)
Kazadzis, S (EN)
Zerefos, C (EN)

journalArticle (EN)

2014-03-01T01:22:26Z
2005 (EN)


Regular aerosol extinction and backscatter measurements using a UV Raman lidar have been performed from January 2001 to December 2004 at Thessaloniki, Greece (40.5°N, 22.9°E), in the framework of the European Aerosol Research Lidar Network (EARLINET). Profiles of the aerosol extinction coefficient, backscatter coefficient, and extinction-to-backscatter ratio (so-called ""lidar ratio"") were acquired under nighttime conditions and have been used for statistical investigations. The statistical analysis was made both for the planetary boundary layer and for the free troposphere. It was found that the 4-year mean boundary layer particle optical depth at 355 nm was 0.44 ± 0.18, and the total aerosol optical depth was 0.63 ± 0.27. Free tropospheric particles account on the average for 30% of the total aerosol optical depth, ranging from 5% (clean free troposphere conditions) to 55% (mainly Saharan dust events). For the cases examined, the integral of the lidar-derived extinction coefficient was in good agreement with colocated aerosol optical depth measurements at 355 nm obtained with a Brewer spectroradiometer. The mean value of the lidar ratio at 355 nm derived, for the period of measurements at Thessaloniki, was 40 sr with a standard deviation of 21 sr. Mean height profiles of the particle lidar ratio, extinction, and backscatter coefficients are shown along with their seasonal dependence, showing a significant seasonal variability in the free troposphere. An analysis of the data using back trajectories showed also a dependence of the aerosol optical depth and the lidar ratio on the origin of the air mass, with higher values mostly corresponding to air masses originating from the northeast Balkans and eastern Europe. Copyright 2005 by the American Geophysical Union. (EN)

Meteorology & Atmospheric Sciences (EN)

Planetary Boundary Layer (EN)
Eastern Europe (EN)
Thessaloniki (EN)
Seasonality (EN)
Aerosol Optical Depth (EN)
Standard Deviation (EN)
remote sensing (EN)
Raman spectroscopy (EN)
Free Troposphere (EN)
Seasonal Variability (EN)
Boundary Layer (EN)
lidar (EN)
Statistical Analysis (EN)
aerosol (EN)

Journal of Geophysical Research D: Atmospheres (EN)

Αγγλική γλώσσα

AMER GEOPHYSICAL UNION (EN)




*Η εύρυθμη και αδιάλειπτη λειτουργία των διαδικτυακών διευθύνσεων των συλλογών (ψηφιακό αρχείο, καρτέλα τεκμηρίου στο αποθετήριο) είναι αποκλειστική ευθύνη των αντίστοιχων Φορέων περιεχομένου.